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The morphology and infraciliature of two soil ciliates, Parafurgasonia zhangi spec. nov. and Chilodonella acuta Kahl, 1931, collected from Saudi Arabia, were investigated by observations of both living cells and specimens after standard staining methods. P. zhangi differs from its congeners by the combination of the following features: excretory pore quite near posterior end of paroral membrane, 16 or 17 somatic kineties with about 11 kinetids in each one on dorsal side, paroral membrane gently curved and composed of about 15 dikinetids, and hypostomial organelle composed of four or five files of kinetids with four monokinetids each. The diagnosis of Chilodonella acuta was renewed to include characteristics revealed by the silver impregnation method: cells in vivo measuring 33-45) × 18-26) µm, dorsal hump and tail-like podite present, two contractile vacuoles, seven left and five right kineties, 9-11 nematodesmal rods, and dorsal brush containing about 11 basal bodies. Phylogenetic analyses based on small-subunit rRNA gene sequences showed that P. zhangi was closer to species of the Colpodidiidae rather than the Furgasoniidae represented by Furgasonia blochmanni, and Chilodonella acuta clustered with its congener Chilodonella uncinata but was a well-outlined species of the genus.

international journal of systematic and evolutionary microbiology

Morphological and molecular characterization of Parafurgasonia zhangi spec. nov. and Chilodonella acuta Kahl, 1931 (Protozoa, Ciliophora), from a soil habitat of Saudi Arabia